AC not blowing cold!!PLZ help!!
Thread Starter
Junior Member
Joined: Nov 2012
Posts: 35
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2003 Mercedes clk55 AMG
AC not blowing cold!!PLZ help!!
i just bought a 2003 w209 clk55 and the AC doesnt seem to cool enough.i live in So cal so it gets pretty hot.i refilled with refrigerant but no difference.i took it to a shop and they found out its blowing 44F and its normal according to them.but this is just not enough.when its 90F out it doesnt get cold enough to the point im comfortable.My GF beetle has much cooler AC compared to mine.please help its getting really hot here.the ac turns on fine and works fine too but its just not blowing cold enough.these are the codes i found doing the test
1. 73
2. 67
3. 46
4. 46
5. 48
6. 203
7. 18
8. 118
1. 73
2. 67
3. 46
4. 46
5. 48
6. 203
7. 18
8. 118
Senior Member
Joined: Dec 2012
Posts: 445
Likes: 11
From: Washington, DC Metro Area
Currently: 2019 E450 AWD, Previous: 2002 CLK55 Cab
Sadly not much help to you but I am having a similar problem with my 02 CLK55. When it is cool in the morning it blows cold air but in the afternoons when it gets in high 90s or yesterday 100, it was hotter with the ac on in the car than it was driving with the windows rolled down. Imagine it was a relief to roll down the windows on a 100 degree day. I was about to buy refrigerant when it was blowing nice and cold again this morning.
Thread Starter
Junior Member
Joined: Nov 2012
Posts: 35
Likes: 0
2003 Mercedes clk55 AMG
Sadly not much help to you but I am having a similar problem with my 02 CLK55. When it is cool in the morning it blows cold air but in the afternoons when it gets in high 90s or yesterday 100, it was hotter with the ac on in the car than it was driving with the windows rolled down. Imagine it was a relief to roll down the windows on a 100 degree day. I was about to buy refrigerant when it was blowing nice and cold again this morning.
MBWorld Fanatic!
Joined: Oct 2012
Posts: 1,427
Likes: 100
From: Florida
2002 CLK 55 AMG cabriolet Eurocharged
The Mercedes is from Europe where climates are a bit different than the US. Volvo always had a bad AC but a good car for the same reason.
The heater is always circulating hot water and the recirculation button is on a timer for safety reasons.
With hot water always circulating next to the evap, The Freon will have to work harder to remove heat.
Recirculation is like your house, taking cool air and making it colder. The Benz times out and reverts to fresh 100^ air. Humidity is the killer here in the US as Europe does not exhibit these temp extremes coupled with humidity.
Other factors contribute to poor cooling like oil saturation and moisture contamination from leaks will effect the refrigerants abilities to remove heat.
I am not knocking anyones opinion of the CCS, Europe or anyone else but I have lots of windshield time in on many of these cars in Florida and brother it is smooookin hot.
Mono valve and hot water recirc systems will fail and cause many of the symptoms reducing the cooling.
Gator
The heater is always circulating hot water and the recirculation button is on a timer for safety reasons.
With hot water always circulating next to the evap, The Freon will have to work harder to remove heat.
Recirculation is like your house, taking cool air and making it colder. The Benz times out and reverts to fresh 100^ air. Humidity is the killer here in the US as Europe does not exhibit these temp extremes coupled with humidity.
Other factors contribute to poor cooling like oil saturation and moisture contamination from leaks will effect the refrigerants abilities to remove heat.
I am not knocking anyones opinion of the CCS, Europe or anyone else but I have lots of windshield time in on many of these cars in Florida and brother it is smooookin hot.
Mono valve and hot water recirc systems will fail and cause many of the symptoms reducing the cooling.
Gator
Senior Member
Joined: Dec 2012
Posts: 445
Likes: 11
From: Washington, DC Metro Area
Currently: 2019 E450 AWD, Previous: 2002 CLK55 Cab
The Mercedes is from Europe where climates are a bit different than the US. Volvo always had a bad AC but a good car for the same reason.
The heater is always circulating hot water and the recirculation button is on a timer for safety reasons.
With hot water always circulating next to the evap, The Freon will have to work harder to remove heat.
Recirculation is like your house, taking cool air and making it colder. The Benz times out and reverts to fresh 100^ air. Humidity is the killer here in the US as Europe does not exhibit these temp extremes coupled with humidity.
Other factors contribute to poor cooling like oil saturation and moisture contamination from leaks will effect the refrigerants abilities to remove heat.
I am not knocking anyones opinion of the CCS, Europe or anyone else but I have lots of windshield time in on many of these cars in Florida and brother it is smooookin hot.
Mono valve and hot water recirc systems will fail and cause many of the symptoms reducing the cooling.
Gator
The heater is always circulating hot water and the recirculation button is on a timer for safety reasons.
With hot water always circulating next to the evap, The Freon will have to work harder to remove heat.
Recirculation is like your house, taking cool air and making it colder. The Benz times out and reverts to fresh 100^ air. Humidity is the killer here in the US as Europe does not exhibit these temp extremes coupled with humidity.
Other factors contribute to poor cooling like oil saturation and moisture contamination from leaks will effect the refrigerants abilities to remove heat.
I am not knocking anyones opinion of the CCS, Europe or anyone else but I have lots of windshield time in on many of these cars in Florida and brother it is smooookin hot.
Mono valve and hot water recirc systems will fail and cause many of the symptoms reducing the cooling.
Gator
Understood but MBZ has been exporting cars to the USA and ME for decades now. One would think that they would have worked through this issue now in later model years. Have they? Even other product lines, like cLS, SL, SLK, E, etc. Haven't they? If not what ate the work atounds that people have tried, bigger condensors, evaporators, etc.
MBWorld Fanatic!
Joined: Oct 2012
Posts: 1,427
Likes: 100
From: Florida
2002 CLK 55 AMG cabriolet Eurocharged
You Bet,
AC will work anywhere, Death Valley, Middle East, Florida and South America. Just not as well at certain times of the year.
I have been working on mine today pulled my back out reaching for the ETC sensor.(evap) The sensor reading's above look favorable.
#5- 48^ supply air is a working system. #1- in car reports 73^. Cool but not cold, Window tint might mask the extra heat, and use recirculation moderately after a time out. Other factors might be the internal dampers not directing the cold air properly.
Heat door hanging up with a comb or lighter some debris. etc..
Don't know if guku is a cab or not but that introduces more cooling issues.
The both of you might need topping up on refrigerant, The sensors readings are not a true gage reading from an AC manifold that I would use to review AC refrigerant problems.
#7 is a pressure sensor showing 18, most systems will not turn on with 18 psi.
Volvo used to use a copper core evap for some time and they outlasted the car in some cases. The copper takes a lot longer to transfer heat than aluminum. The aluminum cools better by transferring heat faster but is easily internally damaged by moisture contamination. In Florida the copper was never efficient enough to keep the cabin ice cold in extreme summer.
The Mercedes Climate Control System introduces hot water into the car any time the temp selected is above Low or defrost. It is very difficult for the AC in any automotive system to overcome hot water in extreme climates.
Hang some gages on that system and we can see what is going on.
Gator
AC will work anywhere, Death Valley, Middle East, Florida and South America. Just not as well at certain times of the year.
I have been working on mine today pulled my back out reaching for the ETC sensor.(evap) The sensor reading's above look favorable.
#5- 48^ supply air is a working system. #1- in car reports 73^. Cool but not cold, Window tint might mask the extra heat, and use recirculation moderately after a time out. Other factors might be the internal dampers not directing the cold air properly.
Heat door hanging up with a comb or lighter some debris. etc..
Don't know if guku is a cab or not but that introduces more cooling issues.
The both of you might need topping up on refrigerant, The sensors readings are not a true gage reading from an AC manifold that I would use to review AC refrigerant problems.
#7 is a pressure sensor showing 18, most systems will not turn on with 18 psi.
Volvo used to use a copper core evap for some time and they outlasted the car in some cases. The copper takes a lot longer to transfer heat than aluminum. The aluminum cools better by transferring heat faster but is easily internally damaged by moisture contamination. In Florida the copper was never efficient enough to keep the cabin ice cold in extreme summer.
The Mercedes Climate Control System introduces hot water into the car any time the temp selected is above Low or defrost. It is very difficult for the AC in any automotive system to overcome hot water in extreme climates.
Hang some gages on that system and we can see what is going on.
Gator
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Thread Starter
Junior Member
Joined: Nov 2012
Posts: 35
Likes: 0
2003 Mercedes clk55 AMG
You Bet,
AC will work anywhere, Death Valley, Middle East, Florida and South America. Just not as well at certain times of the year.
I have been working on mine today pulled my back out reaching for the ETC sensor.(evap) The sensor reading's above look favorable.
#5- 48^ supply air is a working system. #1- in car reports 73^. Cool but not cold, Window tint might mask the extra heat, and use recirculation moderately after a time out. Other factors might be the internal dampers not directing the cold air properly.
Heat door hanging up with a comb or lighter some debris. etc..
Don't know if guku is a cab or not but that introduces more cooling issues.
The both of you might need topping up on refrigerant, The sensors readings are not a true gage reading from an AC manifold that I would use to review AC refrigerant problems.
#7 is a pressure sensor showing 18, most systems will not turn on with 18 psi.
Volvo used to use a copper core evap for some time and they outlasted the car in some cases. The copper takes a lot longer to transfer heat than aluminum. The aluminum cools better by transferring heat faster but is easily internally damaged by moisture contamination. In Florida the copper was never efficient enough to keep the cabin ice cold in extreme summer.
The Mercedes Climate Control System introduces hot water into the car any time the temp selected is above Low or defrost. It is very difficult for the AC in any automotive system to overcome hot water in extreme climates.
Hang some gages on that system and we can see what is going on.
Gator
AC will work anywhere, Death Valley, Middle East, Florida and South America. Just not as well at certain times of the year.
I have been working on mine today pulled my back out reaching for the ETC sensor.(evap) The sensor reading's above look favorable.
#5- 48^ supply air is a working system. #1- in car reports 73^. Cool but not cold, Window tint might mask the extra heat, and use recirculation moderately after a time out. Other factors might be the internal dampers not directing the cold air properly.
Heat door hanging up with a comb or lighter some debris. etc..
Don't know if guku is a cab or not but that introduces more cooling issues.
The both of you might need topping up on refrigerant, The sensors readings are not a true gage reading from an AC manifold that I would use to review AC refrigerant problems.
#7 is a pressure sensor showing 18, most systems will not turn on with 18 psi.
Volvo used to use a copper core evap for some time and they outlasted the car in some cases. The copper takes a lot longer to transfer heat than aluminum. The aluminum cools better by transferring heat faster but is easily internally damaged by moisture contamination. In Florida the copper was never efficient enough to keep the cabin ice cold in extreme summer.
The Mercedes Climate Control System introduces hot water into the car any time the temp selected is above Low or defrost. It is very difficult for the AC in any automotive system to overcome hot water in extreme climates.
Hang some gages on that system and we can see what is going on.
Gator
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